module AWS::Core::AuthorizeV3

def add_authorization! signer
  self.access_key_id = signer.access_key_id
  parts = []
  parts << "AWS3-HTTPS AWSAccessKeyId=#{access_key_id}"
  parts << "Algorithm=HmacSHA256"
  parts << "Signature=#{signer.sign(string_to_sign)}"
  headers['x-amzn-authorization'] = parts.join(',')
end

def string_to_sign
  headers['date'] ||= Time.now.rfc822
end